Coop/run question

Hi,
I'm new to this and will be constructing my coop/ run shortly ( if the snow ever melts here in RI!). My thoughts are as follows:
I'm in a suburban area with about a 5,000sq' backyard. There are lots of skunks, possums, raccoons etc since my property backs up to a wooded area. I'm looking to acquire 3 large hens and build a 4x4 coop with a 8x4 run enclosed with hardware cloth. Since I have a small yard I was debating to do a tractor design with poultry fencing, not chicken wire,on the bottom of the run so nothing can burrow under, that way I could move it around my yard so I don't have an area of dirt from the hens grazing. Is this an acceptable idea?
I could make it stationary and bury hardware cloth to prevent burrowing if you all think that would be a better idea. Figured I would ask first than have to change things when done! Thanks for your help!! BTW, being new to this, I must say that I had no idea chickens were so popular!! Love this site!